What is a wylde chamber? What grain bullets are best for 1:8 twist or 1:9 ? , and what range of grain can you shoot from each? I'm trying to decide if I want to go with 1:9 or 1:8 twist for overall bullet compatability. Milsurp and the accasional 68-75 grain. Newbe here as you can tell. But not for long I hope